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. L1:The LAC Operon. Operon - what is it?The operon is a unit of gene expression and regulationThe structural genes (any gene other than a regulator) for enzymes involved in a specific biosynthetic pathway whose expression is co-ordinately controlled.Control elements such as an operator seq
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1. L1 The lac operon L2 The trp operon L3 Transcriptional regulation by alternative s factors